Apparatus for elliptical turning and boring.



No. 701,217. Patented May 27, I902; A

c. J. MUNTREUIL.

APPARATUS FOR ELLIPTICAL TURNING AND BORING.

(Applicatian filed Sept. 3, 1901.) (No Model.) 3 Sheets-Sheet I.

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No. 701,217. Patented May 27, I902.

c. .1. MONTREUIL.

APPARATUS FOR ELLIPTICAL TURNING AND BORING.

(Application filed Sept. 3, 1901.)

(No Model.) 3 Sheets-Sheet 2.

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Patented May 27, I902.

C. J. MONTREUIL. APPARATUS FOR ELLIPTICAL TURNING AND BORING.

(Application filed Sept. 3, 1901.)

3 Sheets-Sheet 3 (No Model.)

717%zewmz THE cams Ps'rzns co, PNUTO-LITHG, WASHINGTON, n cy UNirnSTATES P TENT OFFICE.

CHARLES JULES MONTREUIL, OF HON'FLEUR, FRANOE.

APPARATUS FOR ELLIPTICAL TURNING AND BORING.

SPECIFICATION forming part of Letters Patent No. 701,217, dated May 27,1902.

Application filed September 3, 1901. 1 Serial No. 74,216. (No model.)

To all whom, it may concern:

Be it known that I, CHARLES J 'ULES MON- TREUIL, a citizen of the FrenchRepublic, residing at Villa Oamlia, Route de Trouville, Honfieur,France, have invented certain new and useful Improvements in Apparatusfor Elliptical Turning and Boring, of which the following is aspecification.

This invention relates to apparatus for elliptical turning and boring,intended more particularly for turning articles of elliptical form incross-section.

In order that my invention may be fully understood, I will proceed todescribe the same with reference to the accompanying drawings, of which-Figure l is a diagrammatic View intended to show the principle on whichthe action of the tool of my improved apparatus is based. Figs. 2 and 3represent in longitudinal elevation and in cross-section, respectively,a part of a lathe constructed and working according to this invention.Fig. 4 is a sectional detail of a portion of the lathe, showing thetool-holder, the supporting means therefor, and the arrangement forguiding the said supporting means. Fig. 5 is a plan of the crankdisk andthe adjusting means therefor. Fig. 6 is a sectional detail of the lathe,showing the adjusting-screw for the slide-rest and its operating means.

Referring to Fig. 1, let OA be a straight line of a length representedby R turning around the point 0, and let AB be another straight line ofa length represented by 1- turning around the point A in a directionopposite to that of the line 0A with double angular velocity of 0A.

Let us suppose that the straight line OA has moved around 0 through anangle a and in the direction of the arrow F and that during thisrotation the straight line AB has moved around the point A through anangle 204 in the opposite direction to that of the arrow F, so that thepoint A comes at A and the point B at B. It may be geometrically proventhat when under these conditions the line OA has made a completerotation around the point 0 the point B has described-an ellipse, suchas E, the semimajor axis of which is a (R-l-r) and the semiminor axis isb (R-r.) It may also be geometrically proven that by joining the point13, obtained as aforesaid, to a point 0 symmetrical with O relatively toA the straight line 0 B is a normal to the ellipse.

Let it be supposed that the ellipse E turns around the center 0 in thedirection of the ar' row F, that the points A and 0 remain stationary,and the point B (the end of the straight line A B) remains in contactwith the ellipse. During one complete rotation of the ellipse E the lineA B or the point B will eflect two complete rotations around thestationary point A and for all the positions of the point B the line 0 Bis a normal to the ellipse.

Now myinvention consists of haviuga toolholder, such as O B,causing thepoin t B of the tool to describe two circumferences around thestationary point A, while the piece to be turned is caused to effect asingle rotation around its center 0. From the foregoing it results thatthe cutting-point B will cut a strictly-correct ellipse out of the pieceturning around 0, and as the direction of the toolholder is always thatof the normal to the ellipse the tool will attack the material to beturned in the best conditions.

I will now describe a practical form of turning-lathe constructed andworking according to this principle, reference being first made to Figs.2 and 3 of the accompanying drawings. The piece 1 to be turned ismounted between the loose headstock and the tail-stock. The tool 2 ismounted in a holder 3 and is capable of sliding in a supporting piece orslide 4, which can turn in a semicircular depression 5 in a table 6 onthe slide-rest. The piece 4 is guided in its movements by the inclinedsurfaces 7 and 8, Fig. 6. The tool-holder 3 is connected by a link 9 andconnecting-rod 10 to a crank-disk 11, adjustable in a slide 12, which iscapable of turning on the journal 13. Both slides 4. and 12 areconnected together by a slotted rod 14 to keep them parallel. The link 9causes the tool-holder 3 to participate in the movement imparted to theconnecting-rod 10 during the rotation of the crank-disk 11.

The crank-pin 15 on the crank-disk can be adjusted in position withrelation to the center of the disk by means of a screw 16, Fig. 7, so asto make '1' (radius of the circle described by the crank-pin or thepoint of the tool) equal to The position of the journal 13 must be soadjusted that the-distance between this journal and the center of thecrank-disk 11 is equal to In order to turn a body of ellipticalcrosssection of given dimensions, the positions of the crank-disk pinand of the journal 13 are adjusted as hereinbefore described. The pointof the tool will then describe a circle Y, Figs. 5 and 3, of appropriateradius and turn an ellipse of the dimensions required.

The crank-disk is actuated as follows: The spindle of the fixedhead-stock is connected by means of spur-wheels to a shaft 20, which iselliptical or of equivalent shape on crosssection and carries a sleeve21, capable of sliding on the said shaft 20 at the same time as itrotates between brackets 22, carried by the slide-rest. On the sleeve 21is a toothed wheel 23, Fig. 4, gearing, through the medium of spur-wheel24, with a spur-wheel 25, keyed on the spindle of the crank-disk 11.This gearing must be so arranged that the crankdisk 11 rotates twice asfast and in the same direction as the piece 1 that is operated on, sothat the point of the tool describes the circle Y twice during onerotation of the piece 1 and in the direction of the latters rotation.

The axle of the intermediate wheel 24 is carried by two oscillating arms26, which permit of this Wheel being thrown out of gear when it isdesired to turn articles of circular section.

The screw 27, which actuates the slide-rest, is driven through a set ofWheels connecting the screw 27 to the spindle of the fast headstock. Theslide-rest may be traversed by turning the hand-wheel 29, which, bymeans ofthe bevel-gear 30, rotates the nut 31, Fig. 8, within the sleeve32 of the support 33, forming part of the slide-rest. By turning thehand-wheel 29 the motion of the slide may be either accelerated orretarded while the screw 27 is rotating, or if this screw be at rest theslide-rest may be traversed by hand.

While the slide-rest is being traversed by the screw 27 the nut 31 isonly kept stationary by its frictional bearing in the sleeve 32 and theresistance of the bevel-gear 30 and the fly-wheel shaft 29. If the toolshould meet with a greater resistance While the sliderest is moving, thescrew 27 will cause the nut 31 to rotate, and the slide-rest will ceaseto be traversed. The slide-rest maybe likewise shifted by means of thepinion 34 and rack 35. The head-stock and the back cencirculardepression a tool-holder 3 capable of sliding in the piece 4, aconnecting-rod 9 and link 10 for connecting the tool-holder with thecrank-pin 15 of a crank-disk 11, a slide 12 for.

guiding the link 10, oscillating on an adjustable journal 13, and aslotted rod 14 connecting piece 4 and the slide 12 so as to keep themparallel, this arrangement being made so as to cause the end of the toolto describe a circle the diameter of which is that described by thecrank-pin, substantially as hereinbefore described and for the purposeset forth.

2. In a lathe for turning articles with elliptical cross-section, thecombination with a slide-rest, of a table having a circular depression,a supporting-piece turning in the circular depression, a tool-holderadapted to slide in the said piece, a disk, a crank-pin therefor, a rodand a link for connecting the crank-pin with the tool-holder, anadjustable journal, a slide oscillating on said journal and adapted toguide said link, a slotted rod for connecting the supporting-piece andslide, spur-wheels 19, a shaft operated by the said spur-wheels, andspur-wheels 24, 25 actuated by the said shaft for operating the saidcrankdisk, the relative proportions of the spurwheels 24, 25 being suchthat the disk turns with an angular velocity twice that of the articlebeing turned.

3. In a lathe, a tool-holder adapted to have a tool suitably connectedthereto, mechanism for reciprocating said tool-holder, mechanism forsupporting and rocking said tool-holder in a circular mannersimultaneously with the reciprocation thereof, operating means for thesaid mechanisms, adjustable means for connecting the supporting androcking mechanism to the said operating means for causing the operationof said mechanism and for changing the degree of circular movement ofthe said tool-holder, and adjustable .means for connecting thereciprocating mechanism to the operating means for operating saidmechanism and for adjusting the reciprocating movement of the tool-holder, substantially as herein shown and described.

4. In a lathe, a tool-holder adapted to have a tool suitably connectedthereto, means for supporting said tool-holder to permit of theoperation thereof in a circular manner, mechanism for reciprocating saidtool holder, mechanism for rocking said tool-holder in a circular mannersimultaneously with the reciprocation thereof, operating means for themy hand in presence of two subscribing Witsaid tool-holder, adjustablemeans connected nesses. to said rocking mechanism and to said operatingmeans for operating the former and for CHARLES JULES MONTREUIL' 5adjusting the reciprocating" movement of the Witnesses:

tool-holder. LoUIs VIELOURET,

In testimony whereof I have hereunto set 1 FIRNAND DURERLES.

